Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 669 · 40 questions

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

1. 1.10 × 9 =
2. 2.84 × 100 =
3. 3.Take 881. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.Magic square (every row, column and diagonal has the same total): 16 14 24 | 26 18 10 | 12 ? 20. What is the missing number?
5. 5.Half of 116 =
6. 6.1 + 2 + 3 + … + 31 =
7. 7.I thought of a number, multiplied it by 4 and added 6. I got 34. What was my number?
8. 8.8?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.33 × 4 =
10. 10.9 × 100 =
11. 11.734 × 10 =
12. 12.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 36 (c) 42 (d) 49
13. 13.I thought of a number, multiplied it by 2 and added 6. I got 18. What was my number?
14. 14.The ages of two twins add up to 8. How old is each twin?
15. 15.9 × 2 = 1? — what is the missing digit?
16. 16.123456789 × 8 + 9 =
17. 17.456 × 10 =
18. 18.Magic square (every row, column and diagonal has the same total): 25 ? 13 | 4 16 28 | 19 22 7. What is the missing number?
19. 19.The 9th of a month is a Wednesday. What day is the 29th of the same month? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
20. 20.396 + 693 =
21. 21.Double 37 =
22. 22.I thought of a number, added 8 and then doubled it. I got 44. What was my number?
23. 23.9 × 6 = 5? — what is the missing digit?
24. 24.37 × 3 =
25. 25.658 × 10 =
26. 26.If today is Friday, what day will it be after 79 days? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
27. 27.24 × 4 =
28. 28.Magic trick! Think of 14. Double it, add 16, halve it, then take away 14. What number do you get?
29. 29.Magic square (every row, column and diagonal has the same total): 26 5 20 | ? 17 23 | 14 29 8. What is the missing number?
30. 30.Magic trick! Think of 16. Double it, add 8, halve it, then take away 16. What number do you get?
31. 31.Magic trick! Think of 4. Double it, add 10, halve it, then take away 4. What number do you get?
32. 32.8 × 4 =
33. 33.Double 66 =
34. 34.Magic trick! Think of 14. Double it, add 4, halve it, then take away 14. What number do you get?
35. 35.297 + 792 =
36. 36.50 × 4 =
37. 37.1 + 2 + 3 + … + 60 =
38. 38.Take 88 and take away the sum of its digits. What do you get?
39. 39.Magic square (every row, column and diagonal has the same total): 6 21 18 | 27 15 3 | 12 ? 24. What is the missing number?
40. 40.9 × 7 = 6? — what is the missing digit?

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